Statistics module is clean XHTML without LeMill design (tables can grow much wider than 800px)

In the first implementation the statistics module should contain the following tables:

Number of members (country, number of users by date, estimated number of users, estimated percentage). Number of users is calculated for the beginning of each month (we should have this data since may 2006). Estimated number of users is calculated with the following formula:
number_of_users_in_country / ((total_number_of_users - number_of_users_without_country)/total_number_of_users)

We might want to generate the whole statistics data once a day, and maybe save it as some static html pages or something. This way it would not start taking too many resources. We should also add the time and date of generation so that person would know what time does the statistics refer to (in addition it would also tell us if something is wrong and statistics does not get recalculated).

Actually for this quantitative data it is even OK if these tables are generated once in a month on the first date. This data is used in presentations / articles / etc. In these cases it is not crucial to have real-time data.

I will change the priority to blocker, because it is now possible to start working with the ticket.